quote odl21:

is this the entire lower portion of the rectangular opening that the radiator bolts up to? its wider at one end than the other.

I believe so. I did just about everything in the article except cut this out. A PO did drill many, many holes in it though.

All I have left to do is add an electric fan. Will not do this until I see that it is necessary. My car is running between 170-190. I’ll be watching this summer to see how it is doing.

I have a 2008 GMC Acadia with a 3.6L V6, it runs at 210 all the time. I assume it is for emissions that the newer engines run hotter.